RF circuit modules and integrated chassis with power interface for RF circuit modules

ABSTRACT

An RF management system especially suitable for use in CATV head end environments is disclosed. The system is characterized by a basic rack-mountable chassis component that can be configured for both front and rear mount applications, for different cable management solutions and for accepting eighteen passive RF modules or nine active RF modules or a combination of passive and active RF circuit modules. The active configuration of the chassis has an integrated power bus with at least nine connectors for receiving up to nine active RF circuit modules. The active RF circuit modules, such as power supplies and amplifiers are each provided with a “floating” connector for ease in connecting the power supply module or amplifier module to the power bus. The RF power supply module is capable of supplying power to all the active RF modules in the chassis as well as to active RF modules mounted in one or more other chassis in the rack.

FIELD OF THE INVENTION

[0001] The present invention relates to the field of radio-frequency(RF) management systems and more particularly to modular RF circuitcomponents and chassis configurations for supporting and interconnectingactive and passive RF circuit modules.

BACKGROUND OF THE INVENTION

[0002] In the telecommunications industry, broadband RF signals aredelivered to consumers via conductors from a head end located, forexample, at the central office of a CATV telecommunications company. Atthe head end, a variety of RF circuit modules are typically mounted inracks of specially designed chassis components. The RF modules carry outthe many kinds of RF signal modifications and manipulations necessary tooperate a telecommunications system, such as a CATV system. Manydifferent types of RF circuit modules and chassis for supporting,connecting and managing the cables associated with the modules are knownin the telecommunications industry.

[0003] A few examples of RF circuit modules and supporting chassiscomponents are disclosed in U.S. Pat. Nos. 5,903,829; 5,909,155;5,955,930; 5,966,648; 6,046,913; 6,049,709; 6,102,214; 6,144,561;6,195,493; and 6,289,210. The versatility and flexibility of many ofthese prior art modules and chassis systems are limited by the numberand type of modules that can be installed in the chassis, by the cablemanagement components mounted to the chassis and by the connectibilityof the various RF modules to each other and to the chassis components.For instance, many of the prior art chassis components are not capableof accepting both active RF modules (amplifiers, power supplies, RFdetector switches), as well as passive RF modules (splitters, combiners,attenuators, equalizers, filters). Many prior art RF modules areprovided with one type of cable connector and one form of cablemanagement component.

[0004] Accordingly, there is a need in the art for an integrated andflexible RF management system that is particularly suited for use inCATV head end environments and that can be configured and reconfiguredin a number of ways depending on the requirements of the CATV operator.There is also a need for versatile rack-mounted chassis components forthe vertical and horizontal mounting of active (powered) and passive(unpowered) RF circuit modules with different cable connectors anddifferent cable management solutions.

SUMMARY OF THE INVENTION

[0005] Accordingly, it is a principal object of the present invention toprovide a versatile and flexible RF management system especiallysuitable for use in CATV head end environments. The inventive system ischaracterized by a basic rack-mountable chassis component that can beconfigured for both front and rear mount applications, for differentcable management solutions and for accepting passive, active or acombination of passive and active RF circuit modules.

[0006] It is another object of the invention is to provide arack-mountable chassis having an integrated power bus with a pluralityof connectors for receiving active RF circuit modules.

[0007] Yet another object of the invention is to provide an active RFcircuit module such as a power supply or amplifier that is provided witha floating connector for ease in connecting the power supply module orother active module to a power bus connector.

[0008] It is still another object of the invention to provide a“hot-swappable,” plug-in RF power supply module that is capable ofsupplying power to all the active RF modules in a rack-mounted chassisas well as to the active RF modules mounted in one or more other chassisin the rack.

[0009] Yet another object of the invention is to provide arack-mountable chassis that can accommodate 18 passive RF modules or 9active RF modules.

[0010] Another object of the invention is to provide a simple, yetversatile chassis component with an integrated power bus for use withboth active and passive RF circuit modules.

[0011] These and other objects and features of the present invention areaccomplished, as embodied and fully described herein according to theinvention, by an RF management system comprising a basic 5 rack unitchassis with an integrated power bus adapted for high-density mountingof up to 18 passive RF modules or 9 active RF modules or combinations ofactive and passive modules. The chassis can be configured for front orrear vertically mounted modules with rear or front cable access,respectively. The chassis can also be provided with different cablemanagement structures, including cable management trays, cablemanagement ears and cable management bars. The system also includes aone rack unit chassis for horizontal mounting of passive RF modules.

[0012] The basic chassis is of simple sheet metal construction designedfor vertical mounting of RF circuit modules. The chassis comprises apair of side walls with flanges for rack mounting. The side walls areconnected by upper and lower shallow, U-shaped brackets each providedwith slots along one longitudinal edge for receiving mating guide pairson the tops and bottoms of the RF modules. If the chassis is intended tobe used with active RF modules, such as a power supply or amplifier, orwith both active and passive RF modules, a planar power bus with 9connectors is mounted in the upper bracket on the side thereofconfronting the lower bracket. A pair of support bars also connects theside walls to strengthen and rigidify the chassis structure.

[0013] The cable management structures are also of sheet metalconstruction and comprise (1) a horizontal tray mounted to the rearlower edges of the side walls in lieu of one of the lower support bar;(2) a pair of vertical plates with ears or fingers extendingperpendicular thereto mounted to the vertical rear edges of the sidewalls; and (3) a one rack unit horizontal tray with routing slotsrack-mountable below a chassis used for rear mounting.

[0014] The RF circuit modules for use with the above-described chassisinclude both active and passive modules. The passive modules may beprovided in a variety of configurations, including 16-way splitters andcombiners, 8-way splitters and combiners, 4-way splitters and combiners,dual 4-way splitters and combiners, 2-way splitters and combiners,triple 2-way splitters/combiners, directional couplers (DC), filters andequalizers. The active modules are “hot-swappable” and include powersupplies in various specifications, e.g., 110VAC to 24VDC, 220VAC to24VDC, 48VDC to 24VDC; amplifiers in a variety of technologies, e.g.,GaAs PD (power doubled), Si PD, Si PP (push pull), GaAs SE (singleended); and RF detector switches.

[0015] The passive modules preferably have cast metal housings withremovable front covers and are provided with a cast guide rail on thetop and bottom of the housing for mating with the slots in the upper andlower mounting brackets of the chassis. The passive modules are providedwith a test point on the front cover for convenient access and may beprovided with F, BNC or CamPort® connectors. The removable front coveron the amplifier module allows convenient access to plug-in pads,equalizers and filters in the amplifier circuitry with the module stillinstalled in the chassis.

[0016] The active modules have sheet metal housings also with removablefront covers. The active module housings may also be manufactured in adiecast format as well. Handles are mounted on the front covers of theactive modules. Test points are also located on the front covers of theactive and passive modules and the power supply module has an LED powerindicator on the front cover. The power supply module is provided with a24 VDC output on the rear of the module that facilitates “daisy-chain”powering between chassis in a rack.

[0017] The active modules are connected to the power bus by means of“floating” connectors mounted for resilient vertical movement tofacilitate alignment of the module connector with one of the nineconnectors mounted on the power bus. The active modules are providedwith a pair of guide rails on the top and bottom of the module housingthat mate with respective slot pairs in the upper and lower mountingbrackets of the chassis.

[0018] Other objects, features and advantages of the present inventionwill become evident to one skilled in the art from the followingdetailed description of the invention in conjunction with theaccompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019]FIG. 1 is a front perspective view of the variously configuredrack-mountable chassis of the present invention in a typical RFmanagement system;

[0020]FIG. 2 is a rear perspective view of the chassis configurations ofthe RF management system of FIG. 1;

[0021]FIG. 3 is a front perspective view of a basic 5 rack unit activechassis of the present invention for front mounted vertical modules;

[0022]FIG. 4 is a front perspective view of a basic 5 rack unit passivechassis of the present invention for rear mounted vertical modules;

[0023]FIG. 5 is a front perspective view of a basic 5 rack unit passivechassis of the present invention for front mounted vertical modules withcable management ears mounted thereto;

[0024]FIG. 6 is a front perspective view of a one rack unit slottedcable management tray of the invention;

[0025]FIG. 7 is a cable management tray used in a standalone fashion orin conjunction with the basic rack unit passive chassis of the presentinvention for rear mounted vertical modules;

[0026]FIG. 8 is a front perspective view of a one rack unit passivechassis of the present invention for front mounted horizontal moduleswith a cable management bar mounted thereto;

[0027]FIG. 9 is a front perspective view of an RF power supply module ofthe present invention;

[0028]FIG. 10 is a rear perspective view of the RF power supply moduleof FIG. 9;

[0029]FIG. 11 is a front perspective view of an RF amplifier module ofthe present invention;

[0030]FIG. 12 is a rear perspective view of the RF amplifier module ofFIG. 11;

[0031]FIG. 13 is an enlarged cross sectional view of the “floating”power connection of the amplifier module taken along line 13-13 of FIG.12;

[0032]FIG. 14 is an enlarged cross sectional view of the “floating”power connection of the amplifier module taken along line 14-14 of FIG.13;

[0033]FIG. 15 is a perspective view of the power bus of the 5 rack unitactive chassis of the present invention shown in FIG. 3; and

[0034]FIG. 16 is an enlarged perspective view of the detail of one ofthe 9 connectors of the power bus of FIG. 15.

DETAILED DESCRIPTION OF THE INVENTION

[0035] Referring now to the drawings in detail, FIGS. 1 and 2 illustratefront and rear perspective views of an RF management system comprising atypical arrangement 10 of passive RF circuit modules in a plurality ofthe rack mountable chassis of the present invention shown without cableconnections for clarity. The arrangement 10 includes, from bottom totop, a 5 rack unit passive chassis 12 for vertically front mountedmodules with a horizontal cable management tray 12 a, a one rack unitslotted cable management tray 14, a 5 rack unit passive chassis 16 forvertically rear mounted modules, a 5 rack unit passive chassis 18 forvertically front mounted modules with cable management ears 18 a, andtwo one rack unit passive chassis 20, 22 for horizontally front mountedmodules with cable management bars 20 a, 22 a. Chassis 12 has eighteenmodule stations in which ten single station passive modules 24 and fourdouble station passive modules 26 are front mounted. Chassis 16 haseighteen module stations in which twelve single station passive modules24 and three double station passive modules 26 are rear mounted. Chassis18 has eighteen module stations in which twelve single station passivemodules 24 and three double station passive modules 26 are frontmounted. Chassis 20 has four side-by-side module stations in which twodouble station passive modules 26 are front mounted and chassis 22 hasfour side-by-side module stations in which one single station passivemodule 24 and one double station passive module 26 are front mounted.

[0036]FIG. 3 illustrates a basic 5 rack unit chassis 30 of the inventionfor vertically front mounted active and passive modules, which ispreferably made of a powder coated, heavy duty sheet steel. The chassis30 comprises identical right and left side walls 32, 34 with rackmounting flanges 36, 38 extending perpendicularly outwardly from arespective side wall. The side walls are provided with large openings40, 42 to facilitate air circulation through the chassis. Side walls 32,34 are connected by upper and lower module mounting brackets 44, 46using threaded fasteners 48.

[0037] Brackets 44, 46 are formed from identical, shallow U-shapedmembers. The forward depending edge 50 of the upper bracket 44 and theforward upstanding edge 52 of the lower bracket 46 are each providedwith eighteen slots 54, 56 and eighteen threaded holes 58, 60 invertical alignment for mounting up to eighteen single station passive RFmodules or as many as nine double station active RF modules. TheU-shaped member of the lower bracket 46 is provided with an insert 62having a further series of eighteen slots 64 to aid in guiding themodules into their proper positions in the chassis 30. In a chassisconfigured to receive active modules, such as chassis 30, instead of theinsert 62, the upper bracket 44 is provided on its underside with aplanar power bus (not shown in FIG. 3), but described in more detailhereinafter in connection with the description of FIGS. 15 and 16. Thus,the U-shaped bracket members of the brackets 44, 46 may both be providedwith inserts 62 for a passive module chassis and one bracket 44 may beprovided with a power bus and the other with an insert 62 for an activemodule chassis.

[0038] Upper and lower identical support bars 66, 68 are connected bythreaded fasteners 48 to the rear edges of the side walls 32, 34 tofurther strengthen the chassis. The basic chassis design is thuscharacterized by a simple, yet robust structure with a variety ofdifferent configurations to be described.

[0039]FIG. 4 illustrates a basic 5 rack unit chassis 70 configured forreceiving rear mounted passive RF modules. The components of the chassis70 include the same identical right and left side walls 32, 34 as thechassis 30. In this configuration, the side walls 32, 34 are connectedat their upper and lower rear edges by a pair of identical brackets 46with inserts 62 corresponding to the lower brackets 46 of the chassis 30for rear mounting up to eighteen single station passive RF modules ornine double station passive RF modules or combinations of the two. Thebrackets 46 are provided with slots and threaded holes in the samemanner as the bracket 46 used in connection with chassis 30 and arefastened to the side walls by threaded fasteners 48. Upper and lowersupport bars 66, 68 are connected by threaded fasteners 48 between theside walls 32, 34 to strengthen the chassis 70. It is to be noted thatthe connecting locations of the brackets 46 and the support bars 66, 68of the chassis 70 have been switched with the connecting locations ofthe brackets 44, 46 and support bars 66, 68 of the chassis 30 shown inFIG. 3.

[0040]FIG. 5 illustrates a basic 5 rack unit chassis 80 configured forreceiving front mounted passive RF modules. The components of thechassis 80 include the same identical right and left side walls 32, 34as the chassis 30 and 70. In this configuration, the side walls 32, 34are connected at their upper and lower edges by a pair of identicalbrackets 46 corresponding to the lower brackets 46 of the chassis 30 forfront mounting up to eighteen single station passive RF modules or ninedouble station passive RF modules or combinations of the two. Thebrackets 46 are provided with the same slots and threaded holes as thebracket 46 used in connection with chassis 30 and 70 and are fastened tothe side walls by threaded fasteners 48. Upper and lower support bars66, 68 are connected by threaded fasteners 48 between the side walls 32,34 to strengthen the chassis 80.

[0041] In the FIG. 5 configuration, a pair of identical cable managementears 82, 84 comprising sheet steel plates are fastened by threadedfasteners 48 to the rear edges of the side walls 32, 34. Cablemanagement ears 82, 84 have a plurality of inwardly directed fingers 86between which cables (not shown) connected to the passive RF modules aredirected. Cable security bars 88, 90 may be fastened to the free ends ofthe fingers 86 to manage and retain the cables in place. Ears 82, 84 areprovided with a hole grid 91 for fastening standard cable tie wraps withpush-mount buttons to facilitate cable management. It is to be notedthat the chassis 80 corresponds to the basic 5 rack unit chassis 30 witha bracket 46 and insert 62 substituted for the upper power bar bracket44 of the chassis 30.

[0042]FIG. 6 illustrates a basic 5 rack unit chassis 100 configured forreceiving front mounted passive RF modules. The components of thechassis 100 include the same identical right and left side walls 32, 34as the chassis 30, 70 and 80. In this configuration, the side walls 32,34 are connected at their upper and lower edges by a pair of identicalbrackets 46 corresponding to the lower brackets 46 of the chassis 30 forfront mounting up to eighteen single station passive RF modules or ninedouble station passive RF modules or combinations of the two. Thebrackets 46 are provided with the same slots and threaded holes as thebracket 46 used in connection with chassis 30 and 70 and are fastened tothe side walls by threaded fasteners 48. Upper support bar 66 isconnected by threaded fasteners 48 between the side walls 32, 34 ofchassis 100. Instead of the lower support bar 68, a horizontal cablemanagement tray 102 is connected between the side walls 32, 34 byfasteners 48. Tray 102 is provided with a hole grid 104 for fasteningstandard cable tie wraps with push-mount buttons to facilitate cablemanagement.

[0043]FIG. 7 illustrates a one rack unit slotted cable management tray110 especially adapted for use with the chassis 70 in which passive RFmodules are rear mounted. The tray 110 comprises a pair of side walls112, 114 between which is connected by threaded fasteners 48 a slottedcable guide 116 formed of upper and lower connecting members 118, 120and a plurality of spaced vertical members 122. A horizontal tray 122having a hole grid 124 for fastening standard cable tie wraps withpush-mount buttons to facilitate cable management.

[0044]FIG. 8 illustrates a one rack unit chassis 130 configured forreceiving up to four single station, horizontally oriented passive RFmodules or two double station, horizontally oriented passive RF modules(not shown). Chassis 130 comprises a pair of side walls 132, 134 betweenwhich are connected by threaded fasteners 48 upper and lower connectingmembers 136, 138. At the ends of the connecting members adjacent eachside wall 132, 134 and in the center of the connecting members areprovided slotted RF module mounting brackets 140, 142 with threadedholes 144 for accepting and securing the passive RF modules. A cablemanagement bar 146 is connected to the rear of the chassis 130 bythreaded fasteners 48.

[0045] Illustrated in FIGS. 9 and 10 is an RF 24 VDC power supply(active) module 200 that is adapted to be front mounted in the 5 rackunit chassis 30 shown in FIG. 3. The power supply may be configured tosupply 24 VDC from 110VAC, 220VAC or −48VDC. Module 200 comprises atwo-part housing 202 a, 202 b made of a sheet metal, such as aluminum,having a removable front cover 204 that is provided with a handle 206 tofacilitate installation and removal of the module 200 from the chassis30. The housing portion 202 b is perforated for heat dissipationpurposes. An LED power indicator 208 is mounted on the front cover 204along with test points 210 for checking the 24VDC output from terminal211 on the rear cover 212 of the housing portion 202 b. Input voltage(110VAC, 220VAC or −48VDC) is supplied to the power supply via aconventional connector plug 214 mounted on the rear cover.

[0046] Housing 202 a is provided on its top and bottom with two pair ofguide rails 216, 218 and 220, 222 adapted to mate with respective slots54, 56 in brackets 44, 46 of chassis 30. Captive, spring-biasedthumbscrews 224 mounted on the front cover 204 are threaded into thethreaded holes 58, 60 in the brackets 44, 46 of chassis 30 to securelyfasten the module 200 in the chassis. A “floating” connector 226(described in detail in connection with FIGS. 13 and 14) extends throughthe top of housing portion 202 a between the guide rails 216, 218.Connector 226 is adapted to connect to one of the connectors of thepower bus (FIGS. 15 and 16) mounted on the underside of bracket 44 tosupply power to other active RF modules, e.g., amplifiers, mounted inthe chassis 30. A connector guard 228 is mounted forwardly of theconnector 226 to protect the connector 226 from damage when the module200 is removed from the chassis 30. An L-shaped hanger 230 is attachedto the top of housing portion 202 b for engaging upper support bar 66 toprovide additional support for the module 200.

[0047] The power supply may also have a terminal block located on itsrear that can be configured to have 24VDC output(s), 24 VDC or −48V DCinput(s), and status outputs (e.g., relay contact(s)) indicating thestatus of a monitored performance parameter such as voltage output orcurrent.

[0048] Power supplies may also be configured to allow for load sharingredundant operation (i.e., two power supplies share the loadrequirements and in the event of one power supply failing the othersupplies the entire load requirement).

[0049] Finally, the power supplies can be configured to monitor thestatus of the supply by monitoring the output voltage and/or currentdraw from the unit.

[0050] Referring now to FIGS. 11 and 12 there is shown an RF amplifiermodule 300 adapted to be front mounted in the 5 rack unit active modulechassis 30 shown in FIG. 3. Module 300 comprises a housing 302 made of asheet metal, such as aluminum, or a cast material, having a removablefront cover 304 that is provided with a handle 306 to facilitateinstallation and removal of the module 300 from the chassis 30. Theremovable front cover exposes the amplifier module circuitry and allowsaccess to signal conditioning elements such as plug in attenuator padsor equalizers. An LED power indicator 308 is mounted on the front cover304 along with a test point 310. An RF input 312, RF output 314 and anRF narrowcast input 316 may be located on the rear plate 315 of thehousing 302, depending on the amplifier configuration. Front access testpoints or injection points (input or output test points) may protrudethrough the front cover. Also mounted on the rear plate 315 may be aheat sink/heat dissipater 317 that dissipates heat from the amplifiercomponents in the housing.

[0051] Housing 302 is provided on its top and bottom with two pair ofguide rails 318, 320 and 322, 324 adapted to mate with respective slots54, 56 in brackets 44, 46 of chassis 30. Captive, spring-biasedthumbscrews 326 mounted on upper and lower ears 323, 325 of housing 302are threaded into the threaded holes 58, 60 in the brackets 44, 46 ofchassis 30 to securely fasten the module 300 in the chassis. A“floating” connector 328 (described in detail in connection with FIGS.13 and 14) extends through the top of housing 302 between the guiderails 318, 320. Connector 328 is adapted to connect to one of theconnectors of the power bus (FIGS. 15 and 16) mounted on the undersideof bracket 44 to supply power to the amplifier circuits enclosed in thehousing 302. A connector guard 330 is mounted forwardly of the connector328 to protect the connector 328 from damage when the module 300 isremoved from the chassis 30.

[0052]FIGS. 13 and 14 illustrate in enlarged detail the “floating”connectors 226, 328 of the active RF modules 200 and 300 as viewed alongline 13-13 of FIG. 11 and will be described with reference to connector328, it being understood that the connector 226 is constructedidentically to connector 328. Connector 328 comprises an 8-socket plug332 electrically connected to a planar circuit board 334 that passesthrough a guide slot 336 in the top 302 a of housing 302. Inside thehousing 302, a fixed standoff 338 with an axially threaded hole in theend thereof is mounted to the rear plate 315 of the housing. A screw 340may have a pair of low friction washers 342, 344 (e.g., nylon washers)thereon passes through a vertically elongated slot 346 in the circuitboard 334 and is threaded into the hole in the end of the standoff 338to support and guide the circuit board 334 for vertical reciprocating(“floating”) movement as shown by the arrow A in FIG. 13. The lower end344 a of circuit board 334 bears on a generally C-shaped leaf spring 348that is supported on a shelf 350 in the housing 302 and is arranged toresiliently support the circuit board 334 for “floating” movement.

[0053] The power supply circuits, amplifier circuits and other activecircuits of the active modules in chassis 30 supply or receive power viathe leads 352, 354 on circuit board 334 which electrically connect thosecircuits to the plug 332 of connectors 226, 328. For example, the powersupply module 200 supplies 24 VDC to the power bus mounted to upperbracket 44 via the connector 226 and the amplifier module 300 receives24VDC from the power bus via connector 328.

[0054] Referring now to FIGS. 15 and 16, a planar power bus 400 made ofa conventional circuit board material is shown mounted in the shallow,U-shaped member that forms the upper bracket 44 of the chassis 30.Attached to power bus 400 at evenly spaced intervals are a plurality(nine in the embodiment shown) of interconnected 8-pin plugs 402 whichmate with the 8-socket plugs 332 of the connectors 226 and 328 of activemodules 200 and 300. The power bus 400 is securely and rigidly held tothe bracket 44 by a plurality of spaced plates 404 that are fastened tothe circuit board material of the power bus and the bracket 44 by meansof threaded fasteners 406 (FIG. 3).

[0055] In light of the foregoing description, it will be appreciated bythose skilled in the art that the present invention provides a highlyversatile RF management system that is characterized by a uniquelysimple combination of chassis components that are designed to beconfigured in a plurality of combinations especially suited to use inthe head end environment of a CATV system. Further, the system isprovided with a unique “floating” connector for the active RF circuitmodules.

[0056] Although certain presently preferred embodiments of the disclosedinvention have been specifically described herein, it will be apparentto those skilled in the art to which the invention pertains thatvariations and modifications of the various embodiments shown anddescribed herein may be made without departing from the spirit and scopeof the invention. Accordingly, it is intended that the invention belimited only to the extent required by the appended claims and theapplicable rules of law.

1. A chassis system for use in mounting RF modules for an RF managementsystem and having a plurality of chassis components adapted to beassembled into one of a plurality of different configurations, saidchassis components comprising identical right and left side walls, eachside wall having an air circulating opening therethough and a flange formounting the chassis to a rack, identical upper and lower shallowU-shaped brackets adapted to connect the side walls in substantiallyparallel, spaced relation, each bracket having a plurality of spacedslots therein for mounting a plurality of RF modules between thebrackets, a support bar adapted to be connected between the side wallsat a location spaced from the brackets and fastener means for securingRF modules to the brackets.
 2. The chassis system of claim 1, includingan elongated planar power bus adapted to be connected to the upperbracket, said power bus having a plurality of electricallyinterconnected connectors mounted thereon in spaced relation forelectrically connecting the power bus to at least some of the RFmodules.
 3. The chassis system of claim 1, including a plurality ofactive and passive RF modules mounted between the brackets.
 4. Thechassis system of claim 2, wherein said lower bracket has an inserttherein with a plurality of spaced slots aligned with the spaced slotsin the lower bracket.
 5. The chassis system of claim 2, wherein thedifferent chassis configurations comprise: (a) a chassis for frontloading active RF modules or active and passive RF modules, said chassishaving left and right side walls, upper and lower brackets, the upperbracket having a power bus mounted thereon, and two support bars; (b) achassis for front loading passive RF modules only, said chassis havingleft and right side walls, upper and lower brackets, the upper and lowerbrackets each having a slotted insert therein and two support bars; and(c) a chassis for rear loading passive RF modules only, said chassishaving left and right side walls, upper and lower brackets, the upperand lower brackets each having a slotted insert therein and two supportbars.
 6. The chassis system of claim 1, including cable managementcomponents comprising cable management ears, a cable management tray anda slotted cable management tray, each cable management component havinga hole grid for fastening standard cable tie wraps, the cable managementears and the cable management tray being connectable between the sidewalls and the slotted cable management tray being rack mountableadjacent a chassis.
 7. The chassis system of claim 6, wherein the cablemanagement ears each comprise a plate fastened to a rear edge of arespective side wall, a plurality of spaced fingers with free endsextending inwardly from each plate and a cable security bar attached tothe free ends of the fingers.
 8. The chassis system of claim 6, whereinthe slotted cable management tray comprises a slotted cable guide havingupper and lower connecting members and a plurality of spaced verticalmembers mounted between the upper and lower connecting members.
 9. Thechassis system of claim 6, wherein the cable management tray isconnected between the side walls in lieu of one of the support bars. 10.The chassis system of claim 1, wherein the chassis components are madeof powder coated sheet steel.
 11. In combination, a chassis for an RFmanagement system and at least one active RF module, said chassiscomprising identical right and left side walls, each side wall having aflange for mounting the chassis to a rack, identical upper and lowershallow U-shaped brackets connecting the side walls in substantiallyparallel, spaced relation, each bracket having a plurality of spacedslots therein for mounting a plurality of RF modules between thebrackets, an elongated planar power bus fastened to the upper bracket,said power bus having a plurality of electrically interconnected firstconnectors mounted thereon in spaced relation for electricallyconnecting the power bus to said active RF module, two support barsconnected between the side walls at a location spaced from the bracketsand fastener means for securing the RF modules in side-by-side relationto the brackets, said active RF module comprising a power supply havinga second connector adapted to connect with one of the first connectorsfor supplying power to the power bus.
 12. The combination of claim 11,including a plurality of RF modules mounted between the upper and lowerbrackets, each RF module having a housing with guide rails thereon forslidably engaging in the slots of a respective upper and lower bracket.13. The combination of claim 12, wherein the second connector isslidably and resiliently mounted to the RF module housing so as to bevertically movable to facilitate engaging said one first connector. 14.The combination of claim 13, wherein the second connector comprises acircuit board with an electrical plug thereon and including a slot inthe housing for slidably receiving the circuit board, a leaf springmounted in the housing for resiliently engaging the circuit board insidethe housing.
 15. The combination of claim 11, wherein said chassis isadapted to receive up to 18 passive RF modules or up to nine active RFmodules or a combination of active and passive RF modules, said powerbus having nine electrically interconnected second connectors mountedthereon.
 16. The combination of claim 12, wherein the plurality of RFmodules are active modules comprising a power supply, an amplifier andan RF detector switch.
 17. The combination of claim 12, wherein theplurality of RF modules are passive modules comprising splitters,combiners, directional couplers, filters and equalizers.
 18. Thecombination of claim 12, wherein the plurality of RF modules comprise apower supply, an amplifier and an RF detector switch.
 19. Thecombination of claim 11, wherein the RF management system is a head endof a CATV system.
 20. The combination of claim 12, wherein each housingof said RF modules has a front cover, the front cover of each RF modulehaving an LED power indicator and a test point, the front cover of eachactive RF module having a handle.
 21. The combination of claim 12,including captive, spring-biased thumbscrews mounted to each housing forreleasably attaching the modules to the chassis.
 22. The combination ofclaim 12, wherein the housing of each active RF module has a top and abottom, a pair of guide rails on each of the top and bottom of thehousing for engaging in corresponding slots on the brackets of thechassis.